Bee Gees had 3 main parts of their career
1 - 1967-73 Bee Gees 1st - Mr. Natrual - 10 albums, 13 top 40 hits, one #1, thought to have run their course after a solid career that had seemingly wound down.
2 - 1974-79 Main Course - Spirits Having Flown - They reinvented themselves and became the biggest act in the world. 3 studio albums, one live album, one of the most successful 5 year stretches ever and included perhaps the single most successful year for any artist ever. They released 13 songs, all were hits, 8 went #1. 45 years later, everyone knows the song Stayin' Alive, even people who don't know who the Bee Gees are.
3 - 1981-2001 - they released 7 studio albums, but only had 1 songs crack the top 20 in the US while they had 8 top 20 songs in the UK. To me it's just insane they couldn't get their music played. Especially since they had some hugely successful albums they wrote and produced for others during that time.
Barry Gibb has written the second most Billboard #1 songs in history (15), behind only Paul McCartney and had a song he wrote hit #1 somewhere in the world in 5 consecutive decades (60s, 70s, 80s, 90s, 2000s and had a UK #1 solo album last year.